Yes, that's all about it... This started yesterday, I tried to export my full video in Huffyuv and suddenly, around 47% (in 50% it is finished, Huffyuv always did this to me) Vegas closes itself without a reason. Tried to export it again and this thing continued to happen. I thought there was a problem with one of my clips so I rendered seperately the first and the second part of the video, and all went perfect - but as a whole, it crashes. And also forgot to mention, after what happens with Vegas I went to see what was finally exported, and all I have is the first 47 seconds of the video, muted, with a filesize of 5.5 Gbs, the same filesize the full video has (around 5 minutes). So, any safe ideas on what to do? Thank you in advance.

At the specific point where it crashes, there are no masks at all. Tried to render the whole thing in Lagarith, even in mp4 format, always the same thing. Also, as far as I've seen in the preview mode while it renders, it messes up some cookie cutters too by removing the feather. Strange thing is, by rendering my video in sections there is no problem at all! It just doesn't make sense. I'm using Sony Vegas 8.0b Pro in Windows 7 64bit...

Try rendering in parts with "render loop section only" or copy and paste in a new project. A new project works better because vegas doesn't need to locate all the files in the full project, this take less RAM